Projectile-tracer.



, .K. WIESER. PROJEGTILE TRACER. APPLICATION FILED MAE.7, 1913.

f Patented Aug. 25,1914.

KARL WIESER, OF BREDENEY, GERMANY, ASSIGNOB. '10 FRIED. KRU-PP AKTIEN- GESELLSCHAFT, OF ESSEN-ON-THEFRUHR, GERMANY.

PROJE-CTILE-TRACER.

To all whom it may concern Be it known that I, KARL Wrnsnn, residing at Bredeney, Germany, a subject of the j shell visible.

Emperor of Germany, have invented a certain new and useful Improvement in Projectile-Tracers, of which the following is a specification. a

The subject matter of the present invention is a projectile tracer, that is a cartridge filled with an illuminating composition and attachable to the shot for the purpose ofmaking the trajectory of the shell visible.

In the drawing is illustrated one embodiment of the present invention and Figure 1 shows a longitudinal section of the projectile tracer with a portion of a shell and cartridge case; and Fig. 2 a section on line 22 of Fig. 1 seen from above.

The illuminatin composition B is in- .closed in a casing of the cartridge, which casing is screwed into the base of. the shell C and reaches back into the propelling charge D. To the rear of the illuminating composition B is to be found a retardlng composition E and behind the latter a comparatively large chamber F. This chamber is formed by the hollow part of a thimble G which at the same time contains the retarding composition E and is inserted into the casing A in such a manner that it will be driven out from the casing A on the ignition of the illuminatingcomposition. In the bottom of the thimble G are provided small holes 9 On firing the projectile the propelling gases from the charge D penetrate through the fine holes g into the chamber F. As the gases now become considerably throttled, on account of the fine holes, only a small portion of greatly expanded propelling gas enters the chamber F while the projectile still remains in the bore of the gun, and this gas portion ignites the retarding composition E after having expanded in this chamber, which retarding composition subsequently transfers the flame to the illumithen composition B. The thimble G will natin first be retained by means of the pro- Specification of Letters Patent.

Application filed March 7, 1913.

pelling gases, in the position wherein it; keeps the casing A closed but will be ejected 5 from the casing'A by the gases generated Q holes communicating between said chamber from the ignition of the illuminating composition B after the shell has left the gun.

Serial No. 752,671.

sition B will then reach out through the rear of the casing A producing a streak of light which will make the trajectory of the As the ignition. of the contents of the described projectiletracer is produced by the propelling gases while expanded or under low pressure and as a consequence no violent excitation of the retarding composition is produced, security of the explosion of the retarding composition (and consequently of vided with a fuse for the illuminating com-- Patented Aug. 25, 19M..-

position, which fuse is com osed of several parts movable relative to eac other; as such a fuse during transport might become active and thereby cause the explosion of the propelling charge of a shot having the arrange ment of the projectile tracer as illustrated in the drawing, unless the fuse has been provided with a complicated safety device.

I claim: l

- 1. A projectile tracer comprising a casin secured in the projectile, an illuminating composition in said casing, a thimble closing the rear end of said casing, a chamber between said illuminating composition and said thimble, the rearwall of said thimble havin fine holes communicating between said chamber and the space containing the propelling charge jfor the'projectile; Whereby only a small portion of considerably. reduced tension of the propelling gases is admitted throughsaid holes into said chamber and after further expanding therein ignites said illuminating composition.

' 2. A projectile tracer comprising a casing secured in the projectile, an illuminating composition in said casing, a thimble closing the-rear end of said casing, said thimble I and the spacerontaining the propelling 5 charge forthe projectile; whereby only a small portion of considerably reduced tension of the propelling gases is admitted through said holes into said chamber and after further expanding therein ignites the retarding charge which subsequently ignites the illuminating composition.

' The foregoing specification signed at Bar-'- KARL WIESER. 11. 8.]

In presence of HELEN NUFER ALBERT F. Nw itn. 

